<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="./lib/vue-2.5.9.js"></script>
</head>

<body>
<div id="app">
    <h3>{{msg}}</h3>
    <label>
        <input type="text" v-model="msg">
    </label>
</div>
<script>
    const vm = new Vue({
        el: "#app",
        data: {
            msg: '哈哈',
        },
    })
</script>
</body>
</html>